.gapArea {
    width: 100%;
    height: 20px;
}
/* float 布局 */
.float-layout {
    width: 300px;
    height: 400px;
    border: 1px solid #000;
}
.float-layout .left {
    width: 100px;
    height: 100%;
    float:left;
    background-color: brown;
}
.float-layout .right {
    overflow: auto;
    height: 100%;
    background-color: aqua;
}


/* flex 布局 */
.flex-layout {
    width: 300px;
    height: 400px;
    border: 1px solid #000;
    display: flex;
}
.flex-layout .left {
    width: 100px;
    height: 100%;
    background-color: brown;
}
.flex-layout .right {
    flex: 1;
    background-color: aqua;
}

/* position 布局 */
.position-layout {
    width: 300px;
    height: 400px;
    border: 1px solid #000;
    position: relative;
}
.position-layout .left {
    width: 100px;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    background-color: brown;
}
.position-layout .right {
    margin-left: 100px;
    height: 100%;
    background-color: aqua;
}

/* flex 三栏布局 */
.flex-layout-three{
    display: flex;
    height: 400px;
}
.flex-layout-three .left{
    width: 100px;
    background-color: brown;
}
.flex-layout-three .right{
    width: 100px;
    background-color: aqua;
}
.flex-layout-three .center{
    flex: 1;
    background-color: yellow;
}


/* float 三栏布局 */
.float-layout-three{
    overflow: hidden;
}

.float-layout-three .left{
    float: left;
    width: 100px;
    height: 400px;
    background-color: brown;
}

.float-layout-three .right{ 
    float: right;
    width: 100px;
    height: 400px;
    background-color: aqua;
}

.float-layout-three .center{
    margin: 0 100px;
    height: 400px;
    background-color: yellow;
}


/* position 三栏布局 */
.position-layout-three{
    position: relative;
    height: 400px;
}
.position-layout-three .left{
    position: absolute;
    left: 0;
    top: 0;
    width: 100px;
    height:100%;
    background-color: brown;
}
.position-layout-three .right{ 
    position: absolute;
    width: 100px;
    height:100%;
    right: 0;
    top: 0;
    background-color: aqua;
}
.position-layout-three .center{ 
    background-color: yellow;
    height:100%;
    margin: 0 100px;
}